期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 263, 期 -, 页码 412-421出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.09.042
关键词
Dissolved organic matter; Heavy metal; Lake sediments; Parallel factor (PARAFAC) analysis; Two-dimensional correlation spectroscopy (2D-COS)
资金
- National Natural Science Foundation of China [51209192, 51079139]
- Innovation Program of the Chinese Academy of Sciences [KZCX2-EW-314]
- Natural Science Foundation of Jiangsu province, China [BK2012501]
- China Postdoctoral Science Foundation [2013M540438]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1301007A]
- State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences [2012SKL007]
- project of Nanjing Institute of Geography and Limnology [NIGLAS2011QD14]
Enhanced knowledge on the binding of heavy metal (HM) with dissolved organic matter (DOM) is essential for understanding the toxicity and migration of HMs. In this study, two-dimensional correlation spectroscopy (2D-COS) and parallel factor (PARAFAC) analysis were combined to characterize the metal binding properties of DOMs, which were respectively extracted from macrophyte- and algal-dominant sediments (named MDOM and ADOM) in a eutrophic shallow lake. 2D absorption COS revealed that MDOM exhibited more HM binding sites (193, 195, 196, 199, 201, 203, 205, 207, 208, 212, 217 nm) than ADOM (201, 205 nm). PARAFAC analysis identified one protein- and two humic-like components from all titrated samples, with each component exhibiting different binding behaviors. The modified Stern-Volmer model showed that PARAFAC-derived components in MDOM had higher conditional stability constants (log Km) than in ADOM, suggesting that macrophyte-dominant sediments might play a more important role in the detoxification of HMs. Meanwhile, low binding abilities of Zn(II)-DOM complexes indicated that the toxicity of zinc in eutrophic lakes should not be overlooked. More aromatic functional groups and binding sites were suggested to be responsible for the high binding ability. 2D-COS was a better approach than PARAFAC analysis for exploring HM-DOM interaction. (C) 2013 Elsevier B.V. All rights reserved.
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